package com.wc.codeforces.模拟.Diverse_Game;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.StringTokenizer;

/**
 * @Author congge
 * @Date 2024/7/18 22:42
 * @description https://codeforces.com/contest/1994/problem/A
 */
public class Main {
    // 思路: 全部往前推一个
    static FastReader sc = new FastReader();
    static PrintWriter out = new PrintWriter(System.out);
    static int N = 15;
    static int[][] a = new int[N][N];
    static int n, m;

    public static void main(String[] args) {
        int T = sc.nextInt();
        while (T-- > 0) {
            n = sc.nextInt();
            m = sc.nextInt();
            for (int i = 1; i <= n; i++) {
                for (int j = 1; j <= m; j++) {
                    a[i][j] = sc.nextInt();
                }
            }
            if (n == 1 && m == 1) out.println(-1);
            else {
                for (int i = 1; i <= n; i++) {
                    for (int j = 1; j <= m; j++) {
                        if (j == m && i != n) {
                            out.println(a[i + 1][1] + " ");
                        } else if (j == m) {
                            out.println(a[1][1]);
                        } else {
                            out.print(a[i][j + 1] + " ");
                        }
                    }
                }
            }
            out.flush();
        }
    }
}

class FastReader {
    StringTokenizer st;
    BufferedReader br;

    FastReader() {
        br = new BufferedReader(new InputStreamReader(System.in));
    }

    String next() {
        while (st == null || !st.hasMoreElements()) {
            try {
                st = new StringTokenizer(br.readLine());
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return st.nextToken();
    }

    int nextInt() {
        return Integer.parseInt(next());
    }

    String nextLine() {
        String s = "";
        try {
            s = br.readLine();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return s;
    }

    long nextLong() {
        return Long.parseLong(next());
    }

    double nextDouble() {
        return Double.parseDouble(next());
    }

    // 是否由下一个
    boolean hasNext() {
        while (st == null || !st.hasMoreTokens()) {
            try {
                String line = br.readLine();
                if (line == null)
                    return false;
                st = new StringTokenizer(line);
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
        return true;
    }
}
